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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0585470e2fba164904e4a6198a297801abfd69db55226e208f62cb15db69488c' 
  AND token = 'v0zdh36as7X4XZX4+Wh20H4RsXEV7/XZwILDeg4oikg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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