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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '214babce21a26433eb36ff8154a8e79d6aece7fbb90b7bda656a8eba4a9d27a9' 
  AND token = 'bp8TojV87O8wKYboTdxs4b6X8Zd3FKiL0PhCsSP55Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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