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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '626103d0551ed133c19ebd0d5e317d3a956b2d2133eb398c2d3f311243195bbb' 
  AND token = 'nBZ9pLH8TLnfXqGyqGs8E0hFP5F0avLkcpb2NB7makM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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