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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b238e18bb0ff40af7599b1ed4929bfa8720abf9175dc63c82a38063f16be59' 
  AND token = 'om7p0yxBx8c57CvFWQDD78jbBEYZcomx91+r5eGF/XY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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