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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20db9ec95a32c2b1529c85955d0e0d9ffa2eb8e9cb9836b2b87454729040c9bc' 
  AND token = 'm88K1r1bQnB1Nhvw2L6q8yq1ItFEEriAkYePTHICvCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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