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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '293ae7e0388fc3b2b7da8553d4c502d17d6dfad4ede35ae938b0a63b422ffbf9' 
  AND token = 'RdVRDlWpGGs1xtrqv7m8FuFgeN835awWW9FJwaXNAno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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