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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '604c865993acc4323b53c7f588167667af8913d311ff4cb713e58c2a434ffb01' 
  AND token = '9nOTbVe1eEh0ex7mmLLP9ebS4bHpVQddCB2w3+2D86g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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