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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d7574c96e1dc14099fff942a244ef3444ab5c8623580ca64cc5c7f6c7f3cf3' 
  AND token = 'BspNmBuhVRdKKk8k7qsYS07JgrqsdyTyuMK/UaqSR2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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