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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa79f71c4cc0af961ce6bc8af92608dd3a5f19a991ba14a06636672feb691137' 
  AND token = 'bmSEzfVjKFyu8OzSyCJoa6tPCGjxs9dJcI8snWp9zjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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