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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6e6aba78799f1aa869905a8d7b515d868efb2a3793eccbb3b5f411cb8ea866' 
  AND token = 'GWagYoDvjJczZUoPLFvg6NZau1eTOpPlH+n1SaPYuNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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