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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6db899a5eac672f8d68d3501276c29ee5aba65b57772c91c10bcac5b6511b14a' 
  AND token = 'i82FzcKBtalPGsv6kf9aXrigNAg8ceZwUCOGrkXCfPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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