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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2a4399c0372cab616c20da123cf2692e10b10d0b57e4d51f32cfd9840147e29' 
  AND token = 'ghrut9rV1Miw2jdC72DhFyOXMl/wFkT6qRLrPhxl26M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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