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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6fbce582ea3a7c1ea299a0261c01370ab65afc8b2eaaebae824dc4e0acdb8ba' 
  AND token = '2s9BJPV1NsYnb9yrUcq6y5OVaxV9n3a7RdN+wiWysC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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