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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc962cc033746c1386d545b1a4b7c30d6fe1dbf9bd14b295cebd9ae972e5625e' 
  AND token = 'LlYEbDJEcre5t1k/R5KwdnMMExTENu70DBKZIOSScmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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