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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa2c0c4f19fc14054e6fa3b38bf0eaff12199234e925ffda3eb8a8956adaaa0' 
  AND token = 'A1+hUx7QSU2B3FkKzKqgqPD6PXawFf9iNnWU3wgB1hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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