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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef6bb7363e4e31f9523416ce1d6ca233196f29a79d93eea4e0d8380e19d5390b' 
  AND token = 'TGd3G/9IOG37747bZg9xgesWk+dSABWtXN+eSM4JtKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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