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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '327b5194a56942b7f2e9915058cb2b3bccf0b695efcc2eebb10812eff892c64b' 
  AND token = 'RHpuUtnPDtQ2UyxC/7DyJd05ZMR/dmPXhsbEd6Jig0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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