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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '106bbaa362446ac1fee42d539f4f751aae4bccabb4065204bbaaf1797b378eea' 
  AND token = '4Duv6vQwmsMDcCe2OCba/2LkZKM6mMG2jw0pICXljLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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