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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1a27c59a2a401524e12158582a0034acc4bfc0e5381371f8a927cdf136beea' 
  AND token = 'nejHovlT8oco8Pys8T+1UJlaN9r7PvzX81atfjWAcZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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