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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1eb2e8a51b7802eade18355ab9b6881cd1db69467f6d0b032a03c9fa60d9dda' 
  AND token = 'RW4+LKeeOO1AWwOUv3fbr+w1PzVGfD8I9D3ztimCO5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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