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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50574753f1576e7f0220b0ec450c8402efd191e157bf9643bccd3d966eec2ee6' 
  AND token = 'amzBeDMtxX8VA/juZtx9wLw7vhe+NaaOy+HpxSTxDkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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