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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3840f04d7e2d6730b985388f3471536f42f12322848af70d73853f3d3d02b7c' 
  AND token = 'mayNE5209JmiV9YZPqsAdiI1pUGi2JE2kNvbC/xdBA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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