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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf22c072352c4d60f7b3d802dfe9494b9aef3dbee6dff61975ba611daff3edc8' 
  AND token = '0srZABRvS/F2FpvrFaSrJLHar8PSjiC2j0I+AKPfMuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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