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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8695802eb94f920ffba663c8ecefa8c4eee1ce14bffae03ab32e9cb861765de1' 
  AND token = 'QZ1RdEzCG8CDHpSa4Mn8LDYS3Jdu5ihAcG4pM0C5n8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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