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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c1a3f2ee4040a2b82a5eb05075245359fc1754090a71b6ea4abc8ad276d58f0' 
  AND token = 'qjYiK+S97IJnSduj2gHni/jnOrS46IsqEnsY6k9JplM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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