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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84d4876c4c77f540886751387019dd69ad2f03408d9646776d02ac89e1e7c13' 
  AND token = 'OhkyKGZxPXxG1gk8anL+nH1Sk2kw3HvtKR1nQruZfE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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