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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e226238f02b8645042ac1ed39561f7c1b3e90f6aaf9742a0b74bc0b644627b' 
  AND token = 't5tqbAXY93BUkgBziMed1Qw4jylnk56ssxsCy5NNh9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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