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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7a550c505a806bba85c1fb03033f04ee302872051bdd3340354684c5d5c9787' 
  AND token = 'MrruvYc9qLppvH4KfDto0Iku9GHzxdhYPXBSmmKh3qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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