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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c58b31fcc236a99034df095e74dc0cefb400af71c8c1fe03d802086589b651' 
  AND token = '6wIx5l0HQVyTu0LJp6lsJmPA8DH/4E9q69dpdvfzM2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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