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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b2e141702aecdfc607b3edd990d2de3eab9b5ae9f67cc035c3cd35392ae81f' 
  AND token = 'U+Fd3dGNWyaDbnXHmnpAHUM+nHo/BrP/mUk3Nn348BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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