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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb6ba29e18d3b5775d40f245d96882b8bd9f5e9710742856060da1c147ff7027' 
  AND token = '1XdBQ/Bn0S/Ig6H0sXJUyx/6E+DH71jFA5CVPNCSeQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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