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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca5538b7f5f1a1b589380780cd711f67248849688c5e295b56620ea0555a4b6' 
  AND token = 'aDV79f4f5ruC7/W985RD8T4/jJOLp6QfU1I/3R/MYlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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