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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89785cf89d986b10818fb8e64a87570866e2dfef51998e0162f60afe6a73b804' 
  AND token = '3E3EoM7aYk1iJ/X3Uy4WO2mqw5Tot7HSTpQQYKqrEb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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