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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a39a51634efb5986255a15d800e1cfc8b2dfb53b13722987a4d665b78b6fc09' 
  AND token = 'znlF9jz08uIF24BSr9LJWtw5QNPM0GjeHpdWNxatCPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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