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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '172df4d1907556be5174c50eddc111f2a47884e05bb92df68fc0314a6b18ab68' 
  AND token = 'IsqakZRZiqp4xODbiGdX2+zHN8a3pb1hevJxU23vOG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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