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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5068d6bb7e514d4bc25e7811a94c79c9df895e21b252355abeae79c70bd7a44f' 
  AND token = 'R4V8xQ4C3SwktHiaG41RG+c/QIHWNMHGOXdn15qHybY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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