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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b56ce813e3c388249cea8f6e95a07a3b465a08059ae1bbeb77b412c77d08e1' 
  AND token = 'CuQRecJzvcGyYm4kj/aaTwwi2OVw4t4VJvkaExXLGcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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