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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f20b8ec1f89bf146740513273c52702f352806af2b4d29ecd4b2a40a1e1239' 
  AND token = 'exAfxtIOEPfjFGp9oerV+DqTqVXzUjeCSGiLkb314PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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