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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b43c79e3832d05c055d6fff09a71ea24221b6d263204c58235210dd0ad8fceba' 
  AND token = 'VrGDEhSWQtLG4uGAGWlS/FLyRYCwjgLymk05ih+t3tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}