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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f52b016854edede42b6b5b3c607af2ab9d64b68bc54588c90b691a55b2f2dd77' 
  AND token = 'h9+26FUxbftfDPVeJ+qMDT5JgQNY3c1/SQAzW08egSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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