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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '004c2c63290563af4db9f014b98c44794137fc141f0bc81483954955c5058519' 
  AND token = 'sor+MyVL5iiqqmvJHCiBnpePblTllC+R+gHtj8HLy+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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