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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4a0635ae5fa16ac5afc831f46c48d391a27d5dba8045f7da0723d366b49d17e' 
  AND token = 'PUJ+G4utoHJyyF+jv03tGXDrsTdys5WB4gXwXFz0noY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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