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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04f1549d6928fa75a6f4512d09e3e6efb01d8bf3f4fd5d276d3eca59f0c8f598' 
  AND token = 'g91vyh23iCD3EfFdrPs5SoO4yNngwGskLpEdIbVbIxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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