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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59e96ce5739cba082a2a2b3bba4615eb6c6128f5a45077f15102958bba9cb9e6' 
  AND token = 'GK4EVMXnr4jqTq+mjarrRvS7MWILkRnvnDC/WPf1THY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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