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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41176a283e85c7fc78ec12f63eee2fa2b98c01592a5c511793169a0673cc84a8' 
  AND token = 'nGHoqQ1lqBr98oHT7zu/cVz+rEusnlrU8dwOC+z/Ke0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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