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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7361c5f8f833f04449ef2b4b69737f0dc32913a45e8880686ce4efc955a4d486' 
  AND token = 'BYiOfuXffocLyDCv4yj4wSjpVCgy1zs8Dl1Q3EziXD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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