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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '905e7dbe188d2fa11c2271e16d0b93ab87e3098d54e4a2e56aa813dd0063a072' 
  AND token = 'dDfgSAzTofhD6C+ZhldmH6d3T+htDApV/3D40toTkMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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