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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83dc2f1ba1abf4c5a9acf73bb9771581d77b5c9297de3f0713b3951e3d4239b0' 
  AND token = 'BAwbr4j7lcwPsBIR0t/ab/vOS8iKUyGMBk+4EiDUR6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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