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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c00e70a14de6d397c37d911bdeec6027a0ce83c6905c2a007723d17e2e875b62' 
  AND token = '60CqSmYGAOWPYQugLf2j74q6M8L7p9lIetZm8IZqAqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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