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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c09edeef629125c7ceb761f31690a5a1ebcc9c58cf4324b56304a9ecba418145' 
  AND token = 'orAHKyXsdTBvFEKoPH4Tt+rT4S4l8T9dQjrlSOX4Qac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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