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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32995213f1849e907e9a6252ce2f5ed6aa2b71da8a8148f7c79cf5038357c2b' 
  AND token = 'De8mzP/a7ftBuFiZA3Pv6txEG/bbzTC8JpVdDbSF9UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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