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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae45caa25d2b56288d6c0dbea91eae3d9d90ec2e3ad5a3939cbc6f1f5bf16b79' 
  AND token = 'Xoj3MDwp1pl1CUyHQvTLczF9RF+gHaEiFdfaAz/Z+ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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